But Zaman (pictured here) said he hasn’t done anything illegal and is only helping people find cheap tickets using publicly available information.

His site Skiplagged.com finds cheap flights by using a strategy called “hidden city” ticketing. Some flights are cheaper if travelers buy tickets to a third destination with the intention of getting off at the layover airport. If travelers use this strategy, they have to buy a one-way ticket and cannot check their bags.

United is suing Zaman for $75,000 in lost revenue.

Zaman said he has no intention of shutting down his web site.

“Giving in to pressure from big corporations will be a bad precedent that I hope to avoid for as long as I can,” he said.

Zaman said he hasn’t paid legal fees yet but is worried about the potential of a big bill.

“Working with experienced lawyers who bill hourly can easily push the cost to several hundreds of thousands if this goes all the way to trial,” he said. “I’m hoping it won’t be that extreme as I definitely won’t win a battle of money.”